Annual report pursuant to Section 13 and 15(d)

CONCENTRATIONS OF REVENUES AND CREDIT RISK (Details)

v3.8.0.1
CONCENTRATIONS OF REVENUES AND CREDIT RISK (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2017
USD ($)
Customer
Supplier
Dec. 31, 2016
USD ($)
Customer
Supplier
Dec. 31, 2015
Customer
Supplier
Concentration Risk [Line Items]      
Accounts receivable $ 25,779 $ 22,193  
Number of major supplier | Supplier 1 1 1
Amount owed to supplier for feedstock purchases $ 8,500 $ 3,700  
Cash insured by the Federal Deposit Insurance Corporation $ 250    
Supplier Concentration Risk [Member]      
Concentration Risk [Line Items]      
Concentration risk, percentage 100.00% 99.40% 100.00%
Sales [Member]      
Concentration Risk [Line Items]      
Number of major customer | Customer 1 1 1
Sales [Member] | Revenue Concentration Risk [Member] | Major Customer One [Member]      
Concentration Risk [Line Items]      
Concentration risk, percentage 19.60% 20.10% 20.10%
Sales [Member] | Foreign Jurisdiction Concentration Risk [Member]      
Concentration Risk [Line Items]      
Concentration risk, percentage 20.80% 23.50% 26.00%
Accounts Receivable [Member] | Major Customer One [Member]      
Concentration Risk [Line Items]      
Accounts receivable $ 5,800 $ 5,100